US4510505A - Thermal printer - Google Patents

Thermal printer Download PDF

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Publication number
US4510505A
US4510505A US06/389,555 US38955582A US4510505A US 4510505 A US4510505 A US 4510505A US 38955582 A US38955582 A US 38955582A US 4510505 A US4510505 A US 4510505A
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United States
Prior art keywords
power supply
thermal head
voltage
thermal
thermal printer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/389,555
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English (en)
Inventor
Hiroshi Fukui
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Canon Inc
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Canon Inc
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Publication date
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Assigned to CANON KABUSHIKI KAISHA, A CORP. OF JAPAN reassignment CANON KABUSHIKI KAISHA, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FUKUI, HIROSHI
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/10—Heated recording elements acting on heatsensitive layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection

Definitions

  • the present invention relates to a thermal printer which keeps a print density at a constant level by controlling a drive pulse, and more particularly to a thermal printer which determines an optimum driving time period, e.g. voltage application time period or energization time period, of a print head in accordance with the number of dots to be simultaneously heated and based on the detected voltage, in order to keep constant the print density irrespective of a change of the voltage applied to the thermal head due to a change of the number of dots to be simultaneously heated.
  • an optimum driving time period e.g. voltage application time period or energization time period
  • the print density in the thermal printer is determined by a calorific quantity of dots.
  • a calorific quantity per dot of a thermal head be constant. That is, the calorific quantity per dot given by
  • W (mf) is a calorific quantity per dot
  • R ( ⁇ ) is a resistance per dot
  • V (volt) is an applied voltage per dot
  • t (ms) is a heating time
  • the applied voltage to the thermal head decreases as an electromotive force of the dry battery decreases.
  • the print density for a given heating time is reduced.
  • the print density is kept at a constant level by increasing the heating time as the electromotive force of the dry battery decreases.
  • a dummy load for a print operation (e.g. a load when the number of simultaneously heated dots is one) is connected to the dry battery and a voltage across the battery is detected to determine an optimum heating time for the detected voltage.
  • a thermal printer which uses a four-phase pulse motor as a stepping motor, resistances of two phases of the motor and a resistance determined by the number of dots to be simultaneously heated constitute the load.
  • Table 1 which shows the resistances when the printer is driven shows a variation of the resistances of the printer due to the number of dots to be simultaneously heated.
  • the applied voltage to the thermal head also changes as shown in FIG. 2 because a ratio of an internal resistance of the dry battery and the load resistance changes.
  • the applied voltage to the thermal head significantly changes depending on the number of dots to be simultaneously heated.
  • the applied voltage to the thermal head is determined by connecting the dummy load, thereafter the heating time is determined. Accordingly, the heating time is determined independent of the number of dots to be simultaneously heated, resulting in a variation in the print density. If a plurality of dots are printed with the same heating time as that which is the maximum for the applied voltage to the thermal head when heating one dot, the print density is reduced because the applied voltage to the thermal head when the plurality of dots are heated is lower than that when one dot is heated.
  • FIG. 1 shows a graph illustrating a relation between an applied voltage to a thermal head and a heating time.
  • FIG. 2 shows a graph illustrating a change of the applied voltage to the thermal head by the number of dots to be simultaneously heated.
  • FIG. 3 shows a block diagram of a thermal printer with a print circuit in accordance with the present invention.
  • FIG. 4 shows a flow chart for explaining the operation of the thermal printer shown in FIG. 3.
  • FIG. 5 shows a time chart for one embodiment of the thermal printer of the present invention
  • FIG. 6 shows a graph illustrating a relation between a drive current and a driver saturation voltage.
  • numeral 1 denotes a host computer which has a keyboard including a plurality of keys for entering data and a print key for instructing the printing of the input data.
  • Numeral 2 denotes a central processing unit (CPU) for controlling a thermal printer connected to the host computer 1.
  • the CPU 2 has a RAM 8 for storing therein a coded information corresponding to the print data supplied from the host computer 1, and a voltage detected by a voltage detector to be described later, a character generator for generating a print pattern in accordance with the coded information, and a ROM 9 which stores therein a heating time table for setting an optimum heating time, e.g.
  • Numeral 3 denotes the voltage detector which detects the voltage of the battery used as the power supply.
  • Numeral 4 denotes the battery used as the power supply, having an internal resistance r.
  • Numeral 5 denotes a driver for driving a thermal head 7 and a pulse motor 6 for moving the thermal head, which are to be described later.
  • Numeral 7 denotes the thermal head having a plurality of heating elements or print elements. In the illustrated embodiment, the thermal head 7 has print elements RD1-RD7 arranged in a vertical line.
  • Numeral 6 denotes the pulse motor for moving the thermal head 7. In the illustrated embodiment, it is a four-phase pulse motor.
  • RM1-RM4 shown in the pulse motor 6 denote four-phase pulse motor windings
  • S1-S3 denote signal lines.
  • the thermal printer thus constructed is now explained with reference to a flow chart shown in FIG. 4 and a timing chart shown in FIG. 5.
  • the data to be printed is entered by the input means such as the keyboard of the host computer 1 and the coded information for the input data is stored in the RAM 8.
  • the host computer 1 issues a print instruction to the CPU 2 through the signal line S1.
  • the CPU 2 instructs the battery voltage detector 3 through the signal line S2 to detect the voltage of the dry battery 4.
  • the CPU 2 issues a signal to the driver 5 through the signal line S3 to supply the output voltage of the dry battery 4 to the motor 6 to excite the four-phase motor winding RM1-RM4 of the motor 6 at a timing shown in a hatched area of the timing chart shown in FIG. 5.
  • a load in an actual print operation comprises two phases of the motor 6 and the dots of the thermal head 7 to be simultaneously heated.
  • the pulse motor 6 is subsequently driven by exciting the windings in a timing shown by S ⁇ 1-S ⁇ 4 in FIG. 5 to move the thermal head 7.
  • examples of the resistance of the pulse motor winding and the resistance of the thermal head 7 are shown in Table 1.
  • the dummy load is applied for several milliseconds until the voltage to be detected is stabilized and two or more samples are averaged taking a variance in the stabilized condition into consideration.
  • the battery voltage detector 3 converts the detected voltage to a digital value by an A/D converter.
  • the detected voltage V' is given by ##EQU1## where V d is a voltage drop across the driver 5 for driving the pulse motor 6 and the thermal head 7, V 0 is a voltage across the dry battery 4, r is the internal resistance of the dry battery 4, and R is a resistance of the thermal head 7 and the pulse motor 6.
  • the CPU 2 When the battery voltage detector 3 sends a detection end signal to the CPU 2, the CPU stores the detected voltage in the RAM 8. If the detected voltage sent from the battery voltage detector 3 is abnormal, for example, too high or too low, the battery voltage is detected again.
  • the CPU 2 refers the print pattern stored in the ROM 9 having the character generator by the print code sent from the host computer 1 through the signal line S1 and stored in the RAM 8. (The above operations correspond to a step 3 in FIG. 4.) Referring to FIGS. 4 and 5, a print operation for a character "A", for example, is now explained.
  • the CPU determines the number of dots of the print pattern which are to be first heated. As shown in FIG. 5, the number of dots to be first heated in printing the character A is six (DT2-DT7) as shown by TC1.
  • the CPU 2 determines, based on the detected voltage, an optimum heating time t 6 for the six dots to be simultaneously heated from the values t 1 , t 2 , t 3 , t 4 , t 5 , t 6 and t 7 of the heating time table stored in the ROM 9 in accordance with the graphs of the voltage versus the number of dots to be simultaneously heated and the driver saturation voltage versus current shown in FIGS. 2 and 6. (The above operations correspond to a step 4 in FIG. 4.) The heating time is calculated based on the graph shown in FIG. 1 which illustrates the relation between the applied voltage to the thermal head 7 and the heating time.
  • the present invention provides a thermal printer which meets a requirement in modern equipment of having an increasing number of dots, such as a KANJI printer or a graphic printer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
US06/389,555 1981-07-03 1982-06-17 Thermal printer Expired - Lifetime US4510505A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56-103235 1981-07-03
JP56103235A JPS585280A (ja) 1981-07-03 1981-07-03 画像記録方法

Publications (1)

Publication Number Publication Date
US4510505A true US4510505A (en) 1985-04-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/389,555 Expired - Lifetime US4510505A (en) 1981-07-03 1982-06-17 Thermal printer

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US (1) US4510505A (enrdf_load_stackoverflow)
JP (1) JPS585280A (enrdf_load_stackoverflow)
DE (1) DE3224445A1 (enrdf_load_stackoverflow)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4663734A (en) * 1984-04-02 1987-05-05 Gulton Industries, Inc. Print pulse controller for a termal printhead
US4675692A (en) * 1984-02-13 1987-06-23 Canon Kabushiki Kaisha Dot printing method and apparatus
US4675700A (en) * 1985-04-01 1987-06-23 Canon Kabushiki Kaisha Thermal printer
US4714363A (en) * 1984-05-18 1987-12-22 Seiko Epson Corporation Print control device for a dot matrix printer
US4758966A (en) * 1986-05-05 1988-07-19 Ncr Canada Ltd. - Ncr Canada Ltee Thermal printing apparatus and method
EP0202922A3 (en) * 1985-05-24 1989-03-15 Ncr Canada Ltd - Ncr Canada Ltee Thermal printing system
US4814789A (en) * 1986-02-12 1989-03-21 Canon Kabushiki Kaisha Thermal recording process and apparatus therefor
US4875056A (en) * 1986-01-17 1989-10-17 Canon Kabushiki Kaisha Thermal recording apparatus with variably controlled energization of the heating elements thereof
US5017948A (en) * 1987-11-27 1991-05-21 Canon Kabushiki Kaisha Ink jet recording device with thermal energy adjustment
US5075698A (en) * 1988-11-04 1991-12-24 Canon Kabushiki Kaisha Method of driving a recording head and a recording apparatus utilizing this method
EP0570909A3 (enrdf_load_stackoverflow) * 1992-05-22 1994-03-16 Seiko Epson Corp
EP0667240A3 (en) * 1994-02-15 1996-12-04 Monarch Marking Systems Inc Battery-powered barcode printer.
US5677721A (en) * 1994-06-09 1997-10-14 Asahi Kogaku Kogyo Kabushiki Kaisha Thermal printer head driving system
US5677577A (en) * 1994-09-23 1997-10-14 Hewlett-Packard Company Reducing energy variations in thermal inkjet printers
US5682504A (en) * 1993-05-18 1997-10-28 Casio Computer Co., Ltd. Driving technique for printhead of thermal printer to improve print quality
US5714994A (en) * 1994-06-09 1998-02-03 Asahi Kogaku Kogyo Kabushiki Kaisha Thermal printer with power save feature
US5784092A (en) * 1993-12-24 1998-07-21 Shinko Electric Co., Ltd. Thermal printer in which head energization period is controlled based on number of heads to be energized
US6141028A (en) * 1992-05-22 2000-10-31 Seiko Epson Corporation Printer and control method therefor
EP1097820A1 (en) * 1999-11-05 2001-05-09 GE Medical Systems Information Technologies, Inc. Thermal recorder for use with battery-powered equipment
US6382774B1 (en) * 1998-12-21 2002-05-07 Seiko Instruments Inc. Printer having energizing pulse width calculating means
US6394571B1 (en) * 1994-07-25 2002-05-28 Canon Kabushiki Kaisha Method and apparatus for controlling printing operation with externally supplied parameters
US6520615B1 (en) * 1999-10-05 2003-02-18 Hewlett-Packard Company Thermal inkjet print head with integrated power supply fault protection circuitry for protection of firing circuitry
US6784908B2 (en) * 2000-11-16 2004-08-31 Olympus Corporation Printer
US6827413B1 (en) 1999-08-24 2004-12-07 Canon Kabushiki Kaisha Printing apparatus, control method of the apparatus, and computer-readable memory
US6891556B2 (en) * 2001-03-23 2005-05-10 Canon Kabushiki Kaisha Image printing method and apparatus

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328990C2 (de) * 1983-08-11 1985-12-12 Pelikan Ag, 3000 Hannover Thermofarbband sowie Verfahren zu dessen Herstellung
JPS60229770A (ja) * 1984-04-28 1985-11-15 Rion Co Ltd サ−マルプリンタ
JPS6349460A (ja) * 1986-08-18 1988-03-02 Casio Comput Co Ltd サ−マルヘツド駆動装置
DE3703813A1 (de) * 1987-02-07 1988-08-18 Pelikan Ag Mehrfach ueberschreibbares thermofarbband
US4764858A (en) * 1987-10-19 1988-08-16 Gulton Industries, Inc. Energy controller
DE3738934A1 (de) * 1987-11-17 1989-05-24 Pelikan Ag Thermofarbband
DE3816636A1 (de) * 1988-05-16 1989-11-23 Pelikan Ag Verfahren zur herstellung eines thermofarbbandes fuer den thermotransferdruck
DE3825437C1 (enrdf_load_stackoverflow) * 1988-07-27 1989-11-16 Pelikan Ag, 3000 Hannover, De
DE3825438A1 (de) * 1988-07-27 1990-02-15 Pelikan Ag Thermofarbband sowie ein verfahren zu dessen herstellung
JPH02258355A (ja) * 1989-03-31 1990-10-19 Toshiba Corp 電子機器
DE4003595A1 (de) * 1990-02-02 1991-08-08 Siemens Ag Verfahren zum bedrucken eines aufzeichnungstraegers mit einem druckkopf
US5142296A (en) * 1990-11-09 1992-08-25 Dataproducts Corporation Ink jet nozzle crosstalk suppression
DE4438600B8 (de) * 1993-10-30 2008-02-28 Pentax Corp. Thermodrucker
DE4421977A1 (de) 1994-06-23 1996-01-11 Pelikan Produktions Ag Thermofarbband
FR2723547B1 (fr) * 1994-08-12 1996-10-18 Axiohm Imprimante thermique destinee a etre associee a un terminal d'installation de traitement de l'information
DE19548033A1 (de) 1995-12-21 1997-07-03 Pelikan Produktions Ag Thermotransferband
DE19632111C1 (de) * 1996-08-08 1998-02-12 Pelikan Produktions Ag Thermotransferfarbband für lumineszierende Schriftzeichen
JP4717470B2 (ja) 2005-02-25 2011-07-06 キヤノン株式会社 記録装置及び記録制御方法

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US4145756A (en) * 1973-12-26 1979-03-20 Texas Instruments Incorporated Thermal line printer
US4219824A (en) * 1978-01-18 1980-08-26 Hitachi, Ltd. Thermal recording apparatus
US4360819A (en) * 1980-03-12 1982-11-23 Tokyo Shibaura Denki Kabushiki Kaisha Thermal recording apparatus
US4407003A (en) * 1981-03-05 1983-09-27 Canon Kabushiki Kaisha Thermal printer

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JPS5364043A (en) * 1976-11-18 1978-06-08 Matsushita Electric Ind Co Ltd Conducting heat-sensitive printer
JPS5421351A (en) * 1977-07-18 1979-02-17 Mitsubishi Electric Corp Heat sensitive recorder
JPS555883A (en) * 1978-06-30 1980-01-17 Nippon Signal Co Ltd:The Method of driving exothermic element
DE2928304C2 (de) * 1978-07-18 1983-01-13 Oki Electric Industry Co., Ltd., Tokyo Steuerschaltung zum Aufrechterhalten einer konstanten Farbintensität bei einer thermischen Aufzeichnungsvorrichtung
JPS5595584A (en) * 1979-01-16 1980-07-19 Seiko Epson Corp Control of thermal printer
JPS5779761A (en) * 1980-11-05 1982-05-19 Sony Corp Drive method for thermo-sensing picture display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145756A (en) * 1973-12-26 1979-03-20 Texas Instruments Incorporated Thermal line printer
US4219824A (en) * 1978-01-18 1980-08-26 Hitachi, Ltd. Thermal recording apparatus
US4360819A (en) * 1980-03-12 1982-11-23 Tokyo Shibaura Denki Kabushiki Kaisha Thermal recording apparatus
US4407003A (en) * 1981-03-05 1983-09-27 Canon Kabushiki Kaisha Thermal printer

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675692A (en) * 1984-02-13 1987-06-23 Canon Kabushiki Kaisha Dot printing method and apparatus
US4663734A (en) * 1984-04-02 1987-05-05 Gulton Industries, Inc. Print pulse controller for a termal printhead
US4714363A (en) * 1984-05-18 1987-12-22 Seiko Epson Corporation Print control device for a dot matrix printer
US4675700A (en) * 1985-04-01 1987-06-23 Canon Kabushiki Kaisha Thermal printer
EP0202922A3 (en) * 1985-05-24 1989-03-15 Ncr Canada Ltd - Ncr Canada Ltee Thermal printing system
US4875056A (en) * 1986-01-17 1989-10-17 Canon Kabushiki Kaisha Thermal recording apparatus with variably controlled energization of the heating elements thereof
US4814789A (en) * 1986-02-12 1989-03-21 Canon Kabushiki Kaisha Thermal recording process and apparatus therefor
US4758966A (en) * 1986-05-05 1988-07-19 Ncr Canada Ltd. - Ncr Canada Ltee Thermal printing apparatus and method
US5017948A (en) * 1987-11-27 1991-05-21 Canon Kabushiki Kaisha Ink jet recording device with thermal energy adjustment
EP0318328B1 (en) * 1987-11-27 1993-10-27 Canon Kabushiki Kaisha Ink jet recording device
US5075698A (en) * 1988-11-04 1991-12-24 Canon Kabushiki Kaisha Method of driving a recording head and a recording apparatus utilizing this method
EP0570909A3 (enrdf_load_stackoverflow) * 1992-05-22 1994-03-16 Seiko Epson Corp
US5639169A (en) * 1992-05-22 1997-06-17 Seiko Epson Corporation Printer and method of control
US6141028A (en) * 1992-05-22 2000-10-31 Seiko Epson Corporation Printer and control method therefor
US5682504A (en) * 1993-05-18 1997-10-28 Casio Computer Co., Ltd. Driving technique for printhead of thermal printer to improve print quality
US5784092A (en) * 1993-12-24 1998-07-21 Shinko Electric Co., Ltd. Thermal printer in which head energization period is controlled based on number of heads to be energized
EP0667240A3 (en) * 1994-02-15 1996-12-04 Monarch Marking Systems Inc Battery-powered barcode printer.
US5745146A (en) * 1994-02-15 1998-04-28 Monarch Marking Systems, Inc. Dynamic strobe compensation control for a barcode printer
US5677721A (en) * 1994-06-09 1997-10-14 Asahi Kogaku Kogyo Kabushiki Kaisha Thermal printer head driving system
US5714994A (en) * 1994-06-09 1998-02-03 Asahi Kogaku Kogyo Kabushiki Kaisha Thermal printer with power save feature
US6394571B1 (en) * 1994-07-25 2002-05-28 Canon Kabushiki Kaisha Method and apparatus for controlling printing operation with externally supplied parameters
US5677577A (en) * 1994-09-23 1997-10-14 Hewlett-Packard Company Reducing energy variations in thermal inkjet printers
US6382774B1 (en) * 1998-12-21 2002-05-07 Seiko Instruments Inc. Printer having energizing pulse width calculating means
US6827413B1 (en) 1999-08-24 2004-12-07 Canon Kabushiki Kaisha Printing apparatus, control method of the apparatus, and computer-readable memory
US6520615B1 (en) * 1999-10-05 2003-02-18 Hewlett-Packard Company Thermal inkjet print head with integrated power supply fault protection circuitry for protection of firing circuitry
EP1097820A1 (en) * 1999-11-05 2001-05-09 GE Medical Systems Information Technologies, Inc. Thermal recorder for use with battery-powered equipment
US6462766B1 (en) 1999-11-05 2002-10-08 Ge Medical Systems Information Technologies, Inc. Thermal recorder for use with battery-powered equipment
US6784908B2 (en) * 2000-11-16 2004-08-31 Olympus Corporation Printer
US6891556B2 (en) * 2001-03-23 2005-05-10 Canon Kabushiki Kaisha Image printing method and apparatus

Also Published As

Publication number Publication date
JPS585280A (ja) 1983-01-12
DE3224445C2 (enrdf_load_stackoverflow) 1991-05-23
JPH0118872B2 (enrdf_load_stackoverflow) 1989-04-07
DE3224445A1 (de) 1983-01-20

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